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/**
 * Copyright © 2012, 2013 dr. ir. Jeroen M. Valk
 * 
 * This file is part of Badgerfish CPX. Badgerfish CPX is free software:
 * you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version. Badgerfish
 * CPX is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU Lesser General Public License for more details. You
 * should have received a copy of the GNU Lesser General Public License along
 * with Badgerfish CPX. If not, see .
 */

package com.googlecode.aaw.badgerfish;

import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import com.googlecode.aaw.arche.Arche;

public abstract class SAXHandler extends DefaultHandler {
	static final private Arche arche = Arche.getArche(SAXHandler.class);
	static final private Logger logger = (Logger) arche.getInstance();
	private final List ancestors = new ArrayList();
	private final List builders = new ArrayList();
	private int depth = 0;

	abstract protected void onDocumentStart();

	abstract protected void onDocumentEnd();

	abstract protected void onElementStart(String tagname);

	abstract protected void onElementEnd(String tagname, String content);

	abstract protected void onElement(String tagname, String value);

	protected final int getDepth() {
		return depth;
	}

	protected final String getAncestor(int index) {
		return ancestors.get(index);
	}

	@Override
	public final void startDocument() throws SAXException {
		logger.info("Parsing...");
		onDocumentStart();
	}

	@Override
	public final void endDocument() throws SAXException {
		logger.info("DONE");
		onDocumentEnd();
	}

	@Override
	public final void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		int i = ancestors.size();
		if (i-- > 0) {
			String tagname = ancestors.get(i);
			if (tagname != null) {
				ancestors.set(i, null);
				logger.debug("<" + tagname + ">");
				onElementStart(tagname);
				++depth;
			}
		}
		ancestors.add(qName);
		builders.add(new StringBuilder());
	}

	@Override
	public final void endElement(String uri, String localName, String qName)
			throws SAXException {
		int i = ancestors.size();
		assert i > 0;
		String tagname = ancestors.remove(--i);
		StringBuilder builder = builders.remove(i);
		if (tagname == null) {
			logger.debug("");
			--depth;
			assert depth == 0;
			onElementEnd(qName, builder.toString());
		} else {
			assert tagname != null && tagname.equals(qName);
			logger.debug("<" + qName + "/>");
			onElement(qName, builder.toString());
		}
	}

	@Override
	public final void characters(char[] ch, int start, int length)
			throws SAXException {
		int i = builders.size();
		assert i > 0;
		builders.get(--i).append(ch, start, length);
	}

}